Knife sharpener



FIG. 1 is a perspective view of the knife sharpener;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right elevation view thereof;

FIG. 5 is a left elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a perspective view of the knife sharpener shown in a second position of use wherein a foot is deployed;

FIG. 9 is a front elevation view thereof;

FIG. 10 is a rear elevation view thereof;

FIG. 11 is a right elevation view thereof;

FIG. 12 is a left elevation view thereof;

FIG. 13 is a top plan view thereof; and,

FIG. 14 is a bottom plan view thereof.

The broken line showing comprises unclaimed subject matter. 

CLAIM The ornamental design for a knife sharpener, as shown and described. 